Writing instrument



FIG. 1 is a perspective view taken from the left and front showing mynew design;

FIG. 2 is a left side elevational view, the right side elevational viewbeing a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. .4 is a rear view thereof;

FIG. 5 is a plan view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines showing a button and writing tip are for illustrativepurposes only and form no part of the claimed design.

The ornamental design for a “writing instrument,” as shown anddescribed.